Commit | Line | Data |
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231c0e0e | 1 | # ceil.m4 serial 8 |
f0007cad | 2 | dnl Copyright (C) 2007, 2009-2012 Free Software Foundation, Inc. |
b81eb646 LC |
3 | dnl This file is free software; the Free Software Foundation |
4 | dnl gives unlimited permission to copy and/or distribute it, | |
5 | dnl with or without modifications, as long as this notice is preserved. | |
6 | ||
7 | AC_DEFUN([gl_FUNC_CEIL], | |
8 | [ | |
9 | m4_divert_text([DEFAULTS], [gl_ceil_required=plain]) | |
10 | AC_REQUIRE([gl_MATH_H_DEFAULTS]) | |
11 | dnl Test whether ceil() can be used without libm. | |
12 | gl_FUNC_CEIL_LIBS | |
13 | if test "$CEIL_LIBM" = "?"; then | |
14 | CEIL_LIBM= | |
15 | fi | |
16 | m4_ifdef([gl_FUNC_CEIL_IEEE], [ | |
17 | if test $gl_ceil_required = ieee && test $REPLACE_CEIL = 0; then | |
18 | AC_CACHE_CHECK([whether ceil works according to ISO C 99 with IEC 60559], | |
19 | [gl_cv_func_ceil_ieee], | |
20 | [ | |
21 | save_LIBS="$LIBS" | |
22 | LIBS="$LIBS $CEIL_LIBM" | |
23 | AC_RUN_IFELSE( | |
24 | [AC_LANG_SOURCE([[ | |
25 | #ifndef __NO_MATH_INLINES | |
26 | # define __NO_MATH_INLINES 1 /* for glibc */ | |
27 | #endif | |
28 | #include <math.h> | |
29 | ]gl_DOUBLE_MINUS_ZERO_CODE[ | |
30 | ]gl_DOUBLE_SIGNBIT_CODE[ | |
231c0e0e LC |
31 | static double dummy (double f) { return 0; } |
32 | int main (int argc, char *argv[]) | |
b81eb646 | 33 | { |
231c0e0e LC |
34 | double (*my_ceil) (double) = argc ? ceil : dummy; |
35 | int result = 0; | |
b81eb646 | 36 | /* Test whether ceil (-0.0) is -0.0. */ |
231c0e0e LC |
37 | if (signbitd (minus_zerod) && !signbitd (my_ceil (minus_zerod))) |
38 | result |= 1; | |
39 | /* Test whether ceil (-0.3) is -0.0. */ | |
40 | if (signbitd (-0.3) && !signbitd (my_ceil (-0.3))) | |
41 | result |= 2; | |
42 | return result; | |
b81eb646 LC |
43 | } |
44 | ]])], | |
45 | [gl_cv_func_ceil_ieee=yes], | |
46 | [gl_cv_func_ceil_ieee=no], | |
47 | [gl_cv_func_ceil_ieee="guessing no"]) | |
48 | LIBS="$save_LIBS" | |
49 | ]) | |
50 | case "$gl_cv_func_ceil_ieee" in | |
51 | *yes) ;; | |
52 | *) REPLACE_CEIL=1 ;; | |
53 | esac | |
54 | fi | |
55 | ]) | |
56 | if test $REPLACE_CEIL = 1; then | |
3d458a81 | 57 | dnl No libraries are needed to link lib/ceil.c. |
b81eb646 LC |
58 | CEIL_LIBM= |
59 | fi | |
60 | AC_SUBST([CEIL_LIBM]) | |
61 | ]) | |
62 | ||
63 | # Determines the libraries needed to get the ceil() function. | |
64 | # Sets CEIL_LIBM. | |
65 | AC_DEFUN([gl_FUNC_CEIL_LIBS], | |
66 | [ | |
67 | gl_CACHE_VAL_SILENT([gl_cv_func_ceil_libm], [ | |
68 | gl_cv_func_ceil_libm=? | |
69 | AC_LINK_IFELSE( | |
70 | [AC_LANG_PROGRAM( | |
71 | [[#ifndef __NO_MATH_INLINES | |
72 | # define __NO_MATH_INLINES 1 /* for glibc */ | |
73 | #endif | |
74 | #include <math.h> | |
75 | double x;]], | |
76 | [[x = ceil(x);]])], | |
77 | [gl_cv_func_ceil_libm=]) | |
78 | if test "$gl_cv_func_ceil_libm" = "?"; then | |
79 | save_LIBS="$LIBS" | |
80 | LIBS="$LIBS -lm" | |
81 | AC_LINK_IFELSE( | |
82 | [AC_LANG_PROGRAM( | |
83 | [[#ifndef __NO_MATH_INLINES | |
84 | # define __NO_MATH_INLINES 1 /* for glibc */ | |
85 | #endif | |
86 | #include <math.h> | |
87 | double x;]], | |
88 | [[x = ceil(x);]])], | |
89 | [gl_cv_func_ceil_libm="-lm"]) | |
90 | LIBS="$save_LIBS" | |
91 | fi | |
92 | ]) | |
93 | CEIL_LIBM="$gl_cv_func_ceil_libm" | |
94 | ]) |